Concrete mixing apparatus



A ril 4, 1933. R. F. LINDOW CONCRETE MIXING APPARATUS 2 Sheets-Sheet 1Filed Dec. 10, 1930 dwwmq a April 1933. R. F. Lmnow 1,903,416

CONCRETE MIXING APPARATUS Filed Dec. 10, 1930 2 Sheets-Sheet 2 nunorrir. Lmnow, or MILWAUKEE, WISCONSIN, ASSIGNO/BQTO' mm BELT 1,

Patented Apr. 4, 1933 V or MILWAUKEE, Wiscons n, A oonrom'rron orwrscousm, V

" comm n mrxme humerus Application flle'd ibeeember 10, 1930. SerialK055013197. 1

This invention'relates toxconcrete mixing apparatus and moreparticularly to apparatus of this character whichfcomprisestWo-or moremixing machines operated in tandem, and has for its principal objectitoprovide an efficient means in the form ofanauxiliary chute fortransferring thepartially mixed concrete from the usual discharge chuteof one mixer into the charging skip of the:adjacent mixer. i

A further object of the invention is toprovide an apparatus of thischaracter which.

will be simple in construction, comparatively inexpensive to manufactureand which may be readily incorporated into new'machine's or with equalfacility attached to mixers already in use. 1 v w i With the above andother objects in View which willjappear as thedescriptionipro. ceeds,the inventionconsists inhthe novel details of construction and;combinations of parts more fully. hereinafter disclosed and particularlypointed out in theqappended claims. a F 1 Referring to the accompanyingdrawings forming apart of this specification in which like referencecharacters designate like parts in all the Views: 1

Figure 1 is a diagrammatic side elevational view of a portion of twoconcrete mix ers of a well known paving type operated in tandem, one ofwhich is provided with an auxiliary discharge chute constructed andarranged in accordance with the present invention; 1

Figure 2 is a fragmentary end elevational View of the mixer shown inFigure l which is provided with the said auxiliary chute; and

Figure 3 is a fragmentary side elevational view of the said mixerillustrating the auxiliary chute in its nonreceiving position.

Referring more particularly to the said drawings the numerals .5 and 6indicate gen-j erally a pair of concrete mixers ofthe well known pavingtype positioned to operate in tandem in accordance with recentlydeveloped practice along this line, whereby increased production ofcompletely mixed conskill'ed in the art. l" i a The mixer 5 is providedwith the usual crete secured as is-well understood those" charging skip,not shown, and with-the frame work 7, mixing drum or receptac1e-8anddischargechute 9 all of" which are ofthe ordinary and well knownconstruction. The said mixer 5 may be provided with the usual bucketand'boom distributing apparatus but this is preferably omitted since inthe present method of operationit is not-necessary and if present mustbe swung out of the way. The mixer 6, is likewise ofordina'ry'construction, having the usual mixing drumg discharge chuteand bucket and'b'oom distributing apparatus, not shown, and the usualcharging skip 10 which is adapted to' be raisedand lowered in ordertoele-vate materials into the drum in the well known man'- ner. a

tomary to chargethe cement, aggregates and water into the drum of thefirst mixer inthe usual manner where they are partially mixed for aperiod of approximately one half the total time required to produce thecomplete mix. At the end of'this'reduc'ed mixing pe riod the partiallymixed concrete is dis charged from the drum of the first mixer into theskip of the second mixer and elevated thereby into the drum of thesecond mixer;

where the-mixing period is completed, after which the completely. mixedconcrete is'dis' charged into the distributing apparatus] of the secondmixer and distributed thereby in the usual manner. This methodofoperation requires that thecharging skip of the=second mixer when:lowered occupy a position where it will receive the partially mixed,con-. crete discharged into the discharge chute of the first mixer.Because of certain structural dimensions, which cannot be well changedin present mixers of 'the'pavin'g; type, it is not practical to positionthe two mixers su-flicient-z' ly close together for the: skipofath'eisecond mixer to occupy this required position with relation tothe discharge chuterofzathe first mixer without interference with thesaid chute during the'swingv' hof thev skip,1 .and it is thereforenecessary to provide an addition a I In the tandemmethod of operation-itis cusbe supported by the side arms .or plates 12 which are pivoted asat 13 in frame members or brackets lt which are rigidly secured to 10said auxiliary chute 11" is adapted to occupy either the positionillustrated in Figure 1, which is its operative position, or theposition illustrated in Figure 3 whichis its non-re ceiving position andtowhich position it must be moved in order topermit of the elevation ofthe skip 10 of the second" mixer as will be readily .apparent fromFigure 1. In other words, when the skip 10-is elevated its outermostedge must swing through the arc of a when in the position shown inFigure 1 and in order to avoid contact of the parts the said auxiliarychute should be automatically 2,5 moved from the position shown in tothat shown in Figure 3.

In the present instance this automatic movement is accomplished throughthe mediumof a pair of arms 15, secured to the members 12 below thepivot 13, each of which carries at its innermost end a suitable weight'16. The said weights are of such value that they will more thancounterbalance the weight of the auxiliary chute 11 and its associatedparts so that the latter will always be urged toward the positionillustrated in Figure 3-through the medium of the said weights. In orderto overcome the action of theseweights and to move the auxiliary chutefrom its, non-receiving to its receiving positionshownin' Figure 1, thearms 15 are extended outwardly into the'pathof the descending skip 10and are preferably provided with suitable plates or shoes 17 which areengaged by theedge portions of the skip 10 in its descent-as will bereadily understood. The weightofthe .said skip is, of course,sufficie'nt to overcome the action of the weights 16 and the parts willtherefore be automatically moved through the medium of the descendingskip from the position shown in Figure 3 to thatshown in Figure 1 wherethe auxiliary chute 11 is in-position to receive the partially mixedconcrete from the dis- Figure 1 intothe skip 10. I

. After such transfer of the charge has been eifected, as the skip 10 iselevated to discharge the partially mixed concretezinto' the drumillustrated and described, it is obvious that 5'those1skilled in the"art may vary the details the'framework 7 "of the first mixer" 5. *Thecircle which intersects the auxiliary chute 11' charge chute 9 andinsure that'it is deposited.

of construction as well as the precise arrangement of parts withoutdeparting from the spirit of the invention, and therefore it is notwished to be limited to the above disclosure except as may be requiredby the claims.

Whatis claimed is: I 1. 'In a concrete mixer, the combination with aframe, a mixing receptacle and a discharge chute, of an auxiliary chutepiv ot'ally mounted on said framefor oscillatory movement to and from aposition in which itmay receive concrete from said discharge "chute; andaweighted arm connected with said auxiliary chute, adapted to normallyurge said auxiliary chute toward its nonreceiving position, saidarmhaving an extension to which a force maybe applied to move saidauxiliary chute to its receiving position. I v 2. The combination with aplurality of {55 concrete'mixers', one of which is provided with aswinging drum-charging skip and another of which has a drum-dischargingchute, of a movable auxiliary chute for receiving concrete from saiddischarge chute. 99 and discharging it into saidcharging skip, saidauxiliary chute having meansengageable'by said charging skip for movingit from a non-receiving to a receiving, position relative to saiddischarge chute. '3. The combination with a plurality of concretemixers, one of which is provided with a swinging drum-charging skip andanother of which has a drum-discharging chute, of a movable auxiliarychute for receiving concrete from said discharge chute and dischargingit into said charging skip, said auxiliary chute having means engageableby said charging skip for moving it from a non-receiving to a'receivingposition relative to said discharge chute; and means for movingsaidauxiliary' chute to non-receiving position when said first namedmeans is disengaged by said'charging skip. Y

.110 4. The combination with a pair of concrete mixers disposed intandem, one of which is provided with a swinging drumcharging skip andthe other of which has a drum-discharging chute, of a pivoted aux iliarychute for receiving concrete from said discharge chute and dischargingit into said charging skip; means connected to said auxiliary chute,engageable by said skip as 7120 it is lowered, for moving said auxiliarychute from a non-receivingto a receiving position relative to saiddischarge chute; and weights for moving said auxiliary chute back tonon-receiving position as said skip is raised. 7 p Intestimony whereof Iaflix my" signature.

RUDOLPH F. LINDOW.

